1. Institute for Applied Life Sciences, Department of Kinesiology, University of Massachusetts, Amherst
2. Department of Epidemiology, University of Alabama at Birmingham
3. Division of Nutrition, Physical Activity, and Obesity, National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, Atlanta, Georgia
4. Division of Epidemiology and Community Health, University of Minnesota, Minneapolis
5. Division of Research, Kaiser Permanente Northern California, Oakland
6. Department of Preventive Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois
7. Department of Health and Human Physiology, Department of Epidemiology, University of Iowa, Iowa City